检索结果-南通市图书馆

Two Diode Lasers Simultaneously Optically Locked by Orthogonal Polarizations of a Monolithic Confocal Cavity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第10期28卷 106-108页

作者： PENG Yu ZHAO Yang LI Ye YANG Tao CAO Jian-Ping FANG Zhan-jun zang er-jun Center of Time and Frequency Metrology National Institute of MetrologyBeijing 100013 Department of Precision Instruments and Mechanology Tsinghua UniversityBeijing 100084

We demonstrate two self-injection locking extended cavity diode lasers(ECDLs)using resonant optical feedback independently from s-and p-polarizations of a monolithic folded Fabry–Perot confocal cavity(MFC).The relative frequency shift of adjacent axial modes of s resonance and p resonance of MFC is around 1.030 *** note measurements between the two ECDLs are performed and present a relative linewidth of 4 *** the help of a narrow-linewidth reference laser,the linewidth of s-component and p-component ECDLs are measured to be about 32 kHz and 40 kHz,respectively.

关键词： CDL cavity MFC

Diode Laser Optically Injected by Resonance of a Monolithic Cavity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第11期28卷 128-130页

作者： PENG Yu ZHAO Yang LI Ye YANG Tao CAO Jian-Ping FANG Zhan-jun zang er-jun Center of Time and Frequency Metrology National Institute of Metrology18 Beisanhuan East Rd.Beijing 100013 Department of Precision Instruments and Mechanology Tsinghua UniversityBeijing 100084

We demonstrate a self-injection locking extended cavity diode laser(ECDL)using resonant optical feedback from the p-polarization of a monolithic folded Fabry–Perot parallel cavity(MFC).The full width at half maximum of the MFC resonance is 31 *** the help of a narrow-linewidth reference laser,the linewidth of the ECDL is measured to be about 7 *** frequency of the laser could be tuned at 160MHz with an amplitude of 40V by a PZT mounted on the monolithic cavity and the voltage tuning coefficient is about 4 MHz/V.

关键词： polarization tuning Optically

High Conversion Efficiency and Power Stability of 532 nm Generation from an External Frequency Doubling Cavity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第9期29卷 87-89页

作者： ZHAO Yang LIN Bai-Ke LI Ye ZHANG Hong-Xi CAO Jian-Ping FANG Zhan-jun LI Tian-Chu zang er-jun Division of Time and Frequency Metrology National Institute of MetrologyBeijing 100013 Department of Precision Instruments and Mechanology Tsinghua UniversityBeijing 100084 st Instruments of China Electronics Technology Group Corporation Qingdao 266555

We present a high-efficiency 532 nm green light conversion from an external cavity-enhanced second harmonic generation(SHG)with a periodically poled KTP crystal(PPKTP).The cavity is a bow-tie ring configuration with a unitized *** the impedance matching is optimized,the coupling efficiency of the fundamental is as high as 95%.Taking into account both the high power output of the second harmonic and the stability of the system,we obtain over 500 mW green passing through the output cavity mirror,corresponding to a net conversion efficiency higher than 75.2%.Under these operating conditions,the power stability is better than±0.25%during 5 *** is the highest conversion efficiency and power stability ever produced in the bow-tie ring cavity with PPKTP for 532 nm generation.

关键词： Efficiency cavity stability

Magneto-Optical Trapping of 88Sr atoms with 689 nm Laser

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第3期28卷 51-54页

作者： WANG Qiang LIN Bai-Ke ZHAO Yang LI Ye WANG Shao-Kai WANG Min-Ming zang er-jun LI Tian-Chu FANG Zhan-jun Division of Electricity and Quantum Metrology National Institute of MetrologyBeijing 100013 Department of Precision Instruments and Mechanology Tsinghua UniversityBeijing 100084

We report the experimental realization of strontium magneto-optical trap(MOT)operating on the intercombination transition lSo-3 P1 at 689nm,namely red MOT.A 689nm laser used for cooling and trapping is injection locked to a master laser,whose linewidth is narrowed to 150 Hz by locking to a high finesse optical reference cavity.88 Sr atoms pre-cooled and trapped by the broad^(1)S_(O)-^(1)P_(l)transition at 461 nm are transferred to the red MOT with the help of a time sequence *** transfer ratio is about 20%and the red MOT's temperature is estimated to be less than 20μK by the time-of-flight(TOF)image analysis.

关键词： optical realization narrow

Magnetic Field Induced Spectroscopy of ^(88)Sr Atoms Probed with a 10 Hz Linewidth Laser

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第1期30卷 95-98页

作者： LIN Yi-Ge WANG Qiang LI Ye LIN Bai-Ke WANG Shao-Kai MENG Fei ZHAO Yang CAO Jian-Ping zang er-jun LI Tian-Chu FANG Zhan-jun School of Opto-Electronics Beijing Institute of TechnologyBeijing 100081 Time and Frequency Metrology Division National Institute of MetrologyBeijing 100013 Department of Precision Instruments and Mechanology Tsinghua UniversityBeijing 100084

We present our experiment on magnetic field induced spectroscopy of the ^(1)S0–^(3)P0 transition of ^(88)Sr atoms with a 10 Hz linewidth *** ^(88)Sr atoms are cooled by two stage laser *** the second stage narrow line laser cooling,the temperature of the atoms is reduced to~3μ*** atoms are then loaded into an 813 nm one-dimensional optical lattice.A homemade 698 nm laser with 10 Hz linewidth and maximum intensity of more than 100 W/cm2 is used to probe the ^(88)Sr atoms in the *** means of a magnetic field of~1 mT and a probe laser with 50 ms pulse and~6 W/cm^(2) intensity,the Doppler free ^(88)Sr ^(1)S0–^(3)P0 transition spectrum with a linewidth of 208 Hz is obtained.

关键词： laser Probe intensity

Nd:YVO_4/KTP环形倍频激光器三次谐波稳频碘吸收谱线超精细结构的研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

光谱学与光谱分析 2005年第5期25卷 641-643页

作者：张辉彭月祥臧二军中国科学院物理研究所计量测试高技术联合实验室北京100080 北京交通大学理学院北京100044 中国计量科学研究院北京100013

采用三次谐波稳频的方法,对Nd:YVO4/KTP环形倍频激光器的碘吸收谱线的超精细结构进行研究,在实验上观测到的两组谱线的超精细结构与理论值基本相符,其中,观测到的R(70)361谱线属于第一激发态跃迁,这一结果尚未见报道。

关键词：三次谐波稳频超精细结构碘吸收谱线

New roles of tumor-derived exosomes in tumor microenvironment

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Cancer Research 2024年第2期36卷 151-166页

作者： Shiqian Chen Jinzhe Sun Huan Zhou Hongbin Lei Dan zang jun Chen Department of Oncology the Second Hospital of Dalian Medical UniversityDalian 116023China Department of Radiotherapy the Second Hospital of Dalian Medical UniversityDalian 116023China

Throughout tumorigenesis, the co-evolution of tumor cells and their surrounding microenvironment leads to the development of malignant phenotypes. Cellular communication within the tumor microenvironment(TME) plays a critical role in influencing various aspects of tumor progression, including invasion and metastasis. The release of exosomes, a type of extracellular vesicle, by most cell types in the body, is an essential mediator of intercellular communication. A growing body of research indicates that tumor-derived exosomes(TDEs) significantly expedite tumor progression through multiple mechanisms, inducing epithelial-mesenchymal transition and macrophage polarization, enhancing angiogenesis, and aiding in the immune evasion of tumor cells. Herein, we describe the formation and characteristics of the TME, and summarize the contents of TDEs and their diverse functions in modulating tumor development. Furthermore, we explore potential applications of TDEs in tumor diagnosis and treatment.

关键词： Tumor-derived exosomes tumorigenesis tumor microenvironment diagnosis treatment

Quantitative characterizations of anisotropic dynamic properties in organic-rich shale with different kerogen content

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第2期21卷 855-865页

作者： Jian-Yong Xie Yan-Ping Fang Xing-Hua Wu Jian'er Zhao jun-Cheng Dai jun-Xing Cao Ji-Xin Deng State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu610059SichuanChina Key Lab of Earth Exploration&Information Techniques of Ministry of Education Geophysical InstituteChengdu University of TechnologyChengdu610059SichuanChina PetroChina Southwest Oil&Gasfield Company Chengdu610017SichuanChina

Understanding the quantitative responses of anisotropic dynamic properties in organic-rich shale with different kerogen content(KC)is of great significance in hydrocarbon exploration and *** controlled experiments with a single variable is challenging for natural shales due to their high variations in components,diagenesis conditions,or pore *** employed the hot-pressing technique to construct 11 well-controlled artificial shale with varying *** artificial shale samples were successive machined into prismatic shape for ultrasonic measurements along different *** revealed bedding perpendicular P-wave velocities are more sensitive to the increasing KC than bedding paralleling velocities due to the preferential alignments of *** elastic stiffnesses except C_(13)are generally decreasing with the increasing KC,the variation of C_(1) and C_(33)on kerogen content are more sensitive than those of C_(44)and C_(66).Apparent dynamic mechanical parameters(v and E)were found to have linear correlation with the true ones from complete anisotropic equations independent of KC,which hold value towards the interpretation of well logs consistently across formations,Anisotropic mechanical parameters(ΔE and brittlenessΔB)tend to decrease with the reducing KC,withΔB showing great sensitivity to KC *** the range of low KC(erve as a significant characterization for highly organic-rich(>10%)shale,compilation of data from natural organic rich-shales globally verified the similar systematic relationships that can be empirically used to predict the fraction of KC in shales.

关键词： Elastic properties Organic shale Anisotropy Kerogen content Physical modeling

An Improved Golden Jackal Optimization Algorithm Based on Multi-strategy Mixing for Solving Engineering Optimization Problems

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2024年第2期21卷 1092-1115页

作者： jun Wang Wen-chuan Wang Kwok-wing Chau Lin Qiu Xiao-xue Hu Hong-fei zang Dong-mei Xu College of Water Resources North China University of Water Resources and Electric PowerZhengzhou450046People’s Republic of China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongPeople’s Republic of China

Nowadays,optimization techniques are required in various engineering domains to find optimal solutions for complex *** a result,there is a growing tendency among scientists to enhance existing nature-inspired algorithms using various evolutionary strategies and to develop new nature-inspired optimization methods that can properly explore the feature *** recently designed nature-inspired meta-heuristic,named the Golden Jackal Optimization(GJO),was inspired by the collaborative hunting actions of the golden jackal in nature to solve various challenging ***,like other approaches,the GJO has the limitations of poor exploitation ability,the ease of getting stuck in a local optimal region,and an improper balancing of exploration and *** overcome these limitations,this paper proposes an improved GJO algorithm based on multi-strategy mixing(LGJO).First,using a chaotic mapping strategy to initialize the population instead of using random parameters,this algorithm can generate initial solutions with good diversity in the search ***,a dynamic inertia weight based on cosine variation is proposed to make the search process more realistic and effectively balance the algorithm's global and local search ***,a position update strategy based on Gaussian mutation was introduced,fully utilizing the guidance role of the optimal individual to improve population diversity,effectively exploring unknown regions,and avoiding the algorithm falling into local *** evaluate the proposed algorithm,23 mathematical benchmark functions,CEC-2019 and CEC2021 tests are *** results are compared to high-quality,well-known optimization *** results of the proposed method are compared from different points of view,including the quality of the results,convergence behavior,and *** superiority and high-quality performance of the proposed method are demonstrated by comparing the ***,to demonstrate

关键词： Golden jackal optimization Chaotic mapping Dynamic inertia weight Dimensional Gaussian variation Muskingum